Wanna use functions, which are defined in files of coffeescript language, to change one of CSS attributes such as display when an user clicking a button or element at a web page? You can follow below instructions. At side of web page, for example: Write down a button of HTML 5 for triggering event <button type="button" name="btn-veggie-list" class="btn-veggie-list">Veggie list</button> Target HTML. For example, it’s an unordered list for items in